高等学校化学学报 ›› 2025, Vol. 46 ›› Issue (7): 20250062.doi: 10.7503/cjcu20250062

• 分析化学 • 上一篇    下一篇

基于铈基金属有机骨架材料UiO-66-(COOH)2构建的荧光法用于检测SO23 -

龚文朋(), 周林楠()   

  1. 黄冈师范学院化学化工学院,黄冈 438000
  • 收稿日期:2025-02-28 出版日期:2025-07-10 发布日期:2025-05-07
  • 通讯作者: 周林楠 E-mail:1539380469@qq.com;zhouln@hgnu.edu.cn
  • 作者简介:龚文朋, 男, 博士, 讲师, 主要从事金属有机骨架复合材料及荧光探针方面的研究. E-mail: 1539380469@qq.com
  • 基金资助:
    湖北省教育厅基础教学研究项目(2023473)

Fluorescent Detection of Sulfite Ions(SO23 -) Based on Cerium-functionalized Metal-organic Framework UiO-66-(COOH)2

GONG Wenpeng(), ZHOU Linnan()   

  1. College of Chemistry and Chemical Engineering,Huanggang Normal University,Huanggang 438000,China
  • Received:2025-02-28 Online:2025-07-10 Published:2025-05-07
  • Contact: ZHOU Linnan E-mail:1539380469@qq.com;zhouln@hgnu.edu.cn
  • Supported by:
    the Basic Education Research Project of Hubei Provincial Department of Education, China(2023473)

摘要:

构建了一种基于金属有机骨架(MOF)材料Ce-UiO-66-(COOH)2的荧光策略, 用于检测SO32-. 首先通过溶剂热法, 以均苯四甲酸为有机配体、 Ce4+为中心离子合成了Ce-UiO-66-(COOH)2材料, 并采用X射线衍射(XRD)、 红外光谱(IR)、 X射线光电子能谱(XPS)和扫描电子显微镜(SEM)等表征手段确认了其结构特征. 在Ce-UiO-66-(COOH)2的催化作用下, SO32-与苯甲酸组成的反应体系中, SO32-被催化转化为硫酸根自由基(SO4·-), 进而诱导苯甲酸转化为具有荧光特性的2-羟基苯甲酸(水杨酸), 从而实现对SO32-的定量检测. 通过荧光光谱和电子自旋共振谱(ESR)验证了该检测过程的机理. 考察了反应时间、 温度、 MOF材料用量及苯甲酸浓度等因素对检测性能的影响, 在优化的条件下获得40~120 mmol/L的线性检测范围, 检出限达8.3 μmol/L. 该方法对常见无机阴离子表现出良好的抗干扰性能, 可应用于雨水和自来水样品中SO32-的定量检测.

关键词: UIO-66-(COOH)2, 自由基反应, SO2, 亚硫酸盐

Abstract:

A fluorescence strategy was constructed based on the metallic organic framework Ce-UIO-66-(COOH)2 to detect SO32-. Firstly, under solvothermal conditions, the Ce-UIO-66-(COOH)2 was synthesized using homophthallic acid and Ce4+ as the organic ligand and central ion. The structure was characterized by X-ray diffraction(XRD), infrared spectroscopy(IR), X-ray photoelectron spectroscopy(XPS), scanning electron microscope(SEM) and energy dispersive spectroscopy(EDS). Employing a reaction system using Ce-UIO-66-(COOH)2, SO32- and benzoic acid, under the catalysis of Ce-UiO-66-(COOH)2, the SO32- was conversed to sulfate radical SO4·-, and then induced benzoic acid to transform into fluorescent molecule 2-hydroxybenzoic acid(salicylic acid), which realizes the detection of SO32-. The detection mechanism was confirmed by fluorescence spectrum and ESR. The influences of time, temperature, dosages of MOF and benzoic acid were explored. Under the optimal conditions, a linear detection range was obtained as 40—120 μmol/L, and the detection limit was 8.3 μmol/L. The method possesses the favourable anti-interference property for common inorganic anions. Meanwhile, it was applied to the determination of SO32- in rainwater and tap water samples, the results are satisfactory.

Key words: UIO-66-(COOH)2, Radical-mediated reaction, Sulfur dioxide(SO2), Sulfite

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